Patent US3718266A successfully refreshed from Google Patents.
US3718266A
Expired / Lapsed
US
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Oil well derrick substructure with carriages for blowout preventers
Assignee: MOORE L CORP
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Filing: 1971-04-15
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Granted: 1973-02-27
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Expires: 1991-04-15
Abstract
Abstract The framework of an oil well derrick substructure has a slot extending from one side inwardly past the well center line, with track means secured to the framework and extending along at least one side of the slot from its inner end to its outer end and then laterally along the adjoining side of the framework. Supported by the track means is a carriage that extends outwardly for supporting a blowout preventer stack. The carriage can be moved along the track means back and forth between a position at the inner end of the slot to a position outside of the slot beside the outside of the framework, whereby a blowout preventer stack can be moved from outside the framework to a position over the well and vice versa.
Inventors
- 👤 R Donnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:45
CPC Classifications
E; E21; E21B; E21B15/00; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
175 words
An oil well derrick substructure comprising a structural steel framework provided with a slot extending from one side inwardly past the well centerline, track means secured to the framework and extending along a side of said slot substantially from its inner end out to its outer end and then laterally along said side of the framework at one side of the slot, the portion of the track means along said side of the framework extending at an angle to the portion of the track means between the inner and outer ends of said slot, a carriage supported by said track means and extending outwardly therefrom as a cantilever for supporting a blowout preventer stack beside the track means, and means for moving the carriaGe along the track means back and forth between a position at the inner end of the slot to a position outside of the slot beside said side of the framework, whereby a blowout preventer stack can be moved from outside the framework to a position over the well and vice versa.
Claim 2
Dependent Claim
175 words
An oil well derrick substructure comprising a structural steel framework provided with a slot extending from one side inwardly past the well centerline, track means secured to the framework and extending along a side of said slot substantially from its inner end out to its outer end and then laterally along said side of the framework at one side of the slot, the portion of the track means along said side of the framework extending at an angle to the portion of the track means between the inner and outer ends of said slot, a carriage supported by said track means and extending outwardly therefrom as a cantilever for supporting a blowout preventer stack beside the track means, and means for moving the carriaGe along the track means back and forth between a position at the inner end of the slot to a position outside of the slot beside said side of the framework, whereby a blowout preventer stack can be moved from outside the framework to a position over the well and vice versa.
Claim 3
Dependent Claim
38 words
An oil well derrick substructure according to claim 1, in which said track means include a rail supporting the upper part of the carriage, and means holding the top of the carriage against movement away from the framework.
Claim 4
Dependent Claim
133 words
An oil well derrick substructure according to claim 1, in which said track means include a rail supporting the upper part of the carriage, and upper and lower track members extending parallel to the rail, the upper member having an outer flange with a surface facing said framework and the lower member having a surface facing away from the framework, the carriage including laterally spaced upper horizontal wheels engaging said flange surface at longitudinally spaced points thereon, and a lower horizontal wheel engaging said surface of said lower member, said carriage moving means including a rack bar secured to said framework parallel to said track means, a pinion journalled in the carriage midway between said wheels and meshing with the rack bar, and a motor carried by the carriage for driving said pinion.
Claim 5
Dependent Claim
86 words
An oil well derrick substructure according to claim 1, in which said track means include a rail, an upper beam parallel to the rail and having an upright flange spaced outwardly from the framework, and a lower track member parallel to the rail, the carriage including means seated on said rail and movable along it for supporting the carriage, upper laterally spaced horizontal wheels engaging the inner surface of said beam flange, and a lower horizontal wheel engaging the outer surface of said lower track member.
Claim 6
Dependent Claim
84 words
An oil well derrick substructure according to claim 1, including second track means secured to the framework at the opposite side of said slot and extending laterally away from the outer end of the slot along said side of the framework, a carriage similar to the first-mentioned carriage supported by the second track means, and means for moving the second carriage along the second track means for moving a blowout preventer stack into the slot when the other carriage is outside of the slot.
Claim 7
Dependent Claim
132 words
An oil well derrick substructure according to claim 1, in which said carriage includes a body, a pair of laterally spaced arms extending outwardly therefrom in the same general direction for supporting a blowout preventer stack, and means pivotally connecting the inner ends of the arms to said body on vertical axes, whereby the outer ends of the arms can be swung laterally away from each other. 7 An oil well derrick substructure according to claim 1, in which said track means include a rail supported by the top of said framework, and means between the framework and the top of the carriage holding the carriage against movement away from the framework, the carriage being provided with means extending over said holding means and resting on said rail for supporting the carriage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |